Add a redundant path to the S-VOL from the host using the multi-path software. For some multi-path software the redundant path is added automatically. Make sure that the host has recognized the GAD secondary volume correctly.
If the interface between the host and the storage systems is NVMe-oF, you might need to reconnect to the NVM subsystem to add or delete a redundant path from the host. When you add a redundant path, reconnect to the NVM subsystem configured with the port for the target redundant path from the host.
If Hitachi Dynamic Link Manager (HDLM) is installed on the server and host mode option 78 is set to the host group of the storage system, add the redundant path and then execute the dlnkmgr refresh -gad command to incorporate the storage system settings to HDLM. For details about HDLM, see the HDLM user documentation.